I'll bet they are VERY large and have POOR receiver sensitivity (like .8 uV).
------ Original Message ------ Received: Sun, 25 Mar 2007 11:19:26 PM CDT From: "nj902" <[EMAIL PROTECTED]> To: [email protected] Subject: [Repeater-Builder] Re: Moto Pulsar 120 > The Pulsar mobile phone is not a 1969 product, they were produced from > the late 1970's through the 1980's. > > These drawer units make good raw materials for building repeaters. > They can be had for next to nothing or even for free, so you can build > a complete repeater for lunch money. Much of the circuitry is of the > same vintage as Micor. The PA's are continuous duty - after all, a > duplex phone transmitter is active for the duration of a phone call - > no PTT. > > Also, these are synthesized radios- but the nifty thing is that there > is no microprocessor - the synthesizer loop is programmed with a diode > matrix. Once you master the logic - you can move it to other > frequencies - and without spending a dime to have channel elements re- > rocked. [these units actually do have a microprocessor for the > supervisory logic - but we remove that for amateur repeater > applications] > > They do have a fixed offset from TX to RX. Since that offset is 5 MHz > at UHF, those can be a full duplex link or repeater in one box. For > VHF, it would be easier to use two drawers since there is only one VCO. > Also, there is no squelch circuit so you will need an audio or squelch > gate board from a Micor or a squelch circuit like the one from Link. > > Finding a manual is necessary for a successful project. > > The drawer unit will have a model number such as T1739 or T1839 > [A,B,C,D, etc.] This will help tell what band the unit is and what > book to look for. You can also open it and look for assembly numbers > that begin with TLD or TLE to determine the band. > > > >
